a(b-1)-3a和a(b+1)-2(b+1)求化简
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a(b-1)-3a和a(b+1)-2(b+1)求化简
a(b-1)-3a和a(b+1)-2(b+1)
求化简
a(b-1)-3a和a(b+1)-2(b+1)求化简
a(b-1)-3a
=ab-a-3a
=ab-4a
a(b+1)-2(b+1)
=ab+a-2b-2